public class Main {
    public static void main(String[] args) {
        // 在这里向大家问好吧
        System.out.println("Hello world!");
        System.out.println("大家好");
        Person fpl = new FanPeilin();
        fpl.sayHello();
        Person gyj = new gaoyujie();
        gyj.sayHello();
        gyj.sayHello();
    }
}